If you’re a fan of ABC’s darling sitcom The Middle, you know exactly what the “Brick whisper” is. It’s almost too hard to explain unless you watch, but basically, it’s a weird tick from eccentric character Brick (Atticus Shaffer), who puts his head down and repeats the last words he’s said in a creepy whisper. It sounds weird, but it’s truly funny on screen.

In this Wednesday’s episode “Hecking Order,” Glee star Chord Overstreet begins a guest stint on the show – as Brick’s new fourth grade teacher, Mr. Wilkerson – and EW has got an exclusive, behind-the-scenes video of Shaffer teaching Overstreet how to do the “Brick whisper.” “It’s a requirement for every guest star,” Shaffer tells Overstreet, of having to learn how to do his patented “whisper.” “Ray Romano, Betty White, everyone who’s on has to learn the ‘whisper.’”